This unusual and intriguing instrument is called a BOING STICK however its real name is a bungkaka or a bilbil sometimes they are referred to as a bamboo buzzer. They are a percussion instrument (idiophone) made from bamboo.
Made from a single length of decorated bamboo, this amusing device produces a FANTASTIC BOING SOUND when tapped against a hand or surface.
The instrument is constructed from a length of buho (bamboo) with a node at the bottom end. The upper half is shaped such that there are two tongues facing each other, while the bottom end acts as a resonator chamber.
Measures 39cm (L) with a diameter of 3cm | 15.75 inches (L) x 1.25 inches diameter
The instrument generates a buzzing sound from the slit between the two tongues when the instrument is struck against the lower palm of the hand of the player. Furthermore, the sound can be altered by covering and uncovering a hole found on the bottom half of the instrument with the thumb of the hand which grasps the instrument.